475 lines
14 KiB
C
475 lines
14 KiB
C
/*
|
|
* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring
|
|
* Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org>
|
|
*
|
|
* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
|
|
* a sensor chip made by National Semiconductor. It reports up to four
|
|
* temperatures (its own plus up to three external ones) with a 1 deg
|
|
* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
|
|
* from National's website at:
|
|
* http://www.national.com/pf/LM/LM83.html
|
|
* Since the datasheet omits to give the chip stepping code, I give it
|
|
* here: 0x03 (at register 0xff).
|
|
*
|
|
* Also supports the LM82 temp sensor, which is basically a stripped down
|
|
* model of the LM83. Datasheet is here:
|
|
* http://www.national.com/pf/LM/LM82.html
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
/*
|
|
* Addresses to scan
|
|
* Address is selected using 2 three-level pins, resulting in 9 possible
|
|
* addresses.
|
|
*/
|
|
|
|
static const unsigned short normal_i2c[] = {
|
|
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
|
|
|
|
/*
|
|
* Insmod parameters
|
|
*/
|
|
|
|
I2C_CLIENT_INSMOD_2(lm83, lm82);
|
|
|
|
/*
|
|
* The LM83 registers
|
|
* Manufacturer ID is 0x01 for National Semiconductor.
|
|
*/
|
|
|
|
#define LM83_REG_R_MAN_ID 0xFE
|
|
#define LM83_REG_R_CHIP_ID 0xFF
|
|
#define LM83_REG_R_CONFIG 0x03
|
|
#define LM83_REG_W_CONFIG 0x09
|
|
#define LM83_REG_R_STATUS1 0x02
|
|
#define LM83_REG_R_STATUS2 0x35
|
|
#define LM83_REG_R_LOCAL_TEMP 0x00
|
|
#define LM83_REG_R_LOCAL_HIGH 0x05
|
|
#define LM83_REG_W_LOCAL_HIGH 0x0B
|
|
#define LM83_REG_R_REMOTE1_TEMP 0x30
|
|
#define LM83_REG_R_REMOTE1_HIGH 0x38
|
|
#define LM83_REG_W_REMOTE1_HIGH 0x50
|
|
#define LM83_REG_R_REMOTE2_TEMP 0x01
|
|
#define LM83_REG_R_REMOTE2_HIGH 0x07
|
|
#define LM83_REG_W_REMOTE2_HIGH 0x0D
|
|
#define LM83_REG_R_REMOTE3_TEMP 0x31
|
|
#define LM83_REG_R_REMOTE3_HIGH 0x3A
|
|
#define LM83_REG_W_REMOTE3_HIGH 0x52
|
|
#define LM83_REG_R_TCRIT 0x42
|
|
#define LM83_REG_W_TCRIT 0x5A
|
|
|
|
/*
|
|
* Conversions and various macros
|
|
* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
|
|
*/
|
|
|
|
#define TEMP_FROM_REG(val) ((val) * 1000)
|
|
#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
|
|
(val) >= 127000 ? 127 : \
|
|
(val) < 0 ? ((val) - 500) / 1000 : \
|
|
((val) + 500) / 1000)
|
|
|
|
static const u8 LM83_REG_R_TEMP[] = {
|
|
LM83_REG_R_LOCAL_TEMP,
|
|
LM83_REG_R_REMOTE1_TEMP,
|
|
LM83_REG_R_REMOTE2_TEMP,
|
|
LM83_REG_R_REMOTE3_TEMP,
|
|
LM83_REG_R_LOCAL_HIGH,
|
|
LM83_REG_R_REMOTE1_HIGH,
|
|
LM83_REG_R_REMOTE2_HIGH,
|
|
LM83_REG_R_REMOTE3_HIGH,
|
|
LM83_REG_R_TCRIT,
|
|
};
|
|
|
|
static const u8 LM83_REG_W_HIGH[] = {
|
|
LM83_REG_W_LOCAL_HIGH,
|
|
LM83_REG_W_REMOTE1_HIGH,
|
|
LM83_REG_W_REMOTE2_HIGH,
|
|
LM83_REG_W_REMOTE3_HIGH,
|
|
LM83_REG_W_TCRIT,
|
|
};
|
|
|
|
/*
|
|
* Functions declaration
|
|
*/
|
|
|
|
static int lm83_detect(struct i2c_client *new_client, int kind,
|
|
struct i2c_board_info *info);
|
|
static int lm83_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id);
|
|
static int lm83_remove(struct i2c_client *client);
|
|
static struct lm83_data *lm83_update_device(struct device *dev);
|
|
|
|
/*
|
|
* Driver data (common to all clients)
|
|
*/
|
|
|
|
static const struct i2c_device_id lm83_id[] = {
|
|
{ "lm83", lm83 },
|
|
{ "lm82", lm82 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm83_id);
|
|
|
|
static struct i2c_driver lm83_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm83",
|
|
},
|
|
.probe = lm83_probe,
|
|
.remove = lm83_remove,
|
|
.id_table = lm83_id,
|
|
.detect = lm83_detect,
|
|
.address_data = &addr_data,
|
|
};
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct lm83_data {
|
|
struct device *hwmon_dev;
|
|
struct mutex update_lock;
|
|
char valid; /* zero until following fields are valid */
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
/* registers values */
|
|
s8 temp[9]; /* 0..3: input 1-4,
|
|
4..7: high limit 1-4,
|
|
8 : critical limit */
|
|
u16 alarms; /* bitvector, combined */
|
|
};
|
|
|
|
/*
|
|
* Sysfs stuff
|
|
*/
|
|
|
|
static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct lm83_data *data = lm83_update_device(dev);
|
|
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
|
|
}
|
|
|
|
static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm83_data *data = i2c_get_clientdata(client);
|
|
long val = simple_strtol(buf, NULL, 10);
|
|
int nr = attr->index;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
data->temp[nr] = TEMP_TO_REG(val);
|
|
i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
|
|
data->temp[nr]);
|
|
mutex_unlock(&data->update_lock);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
|
|
char *buf)
|
|
{
|
|
struct lm83_data *data = lm83_update_device(dev);
|
|
return sprintf(buf, "%d\n", data->alarms);
|
|
}
|
|
|
|
static ssize_t show_alarm(struct device *dev, struct device_attribute
|
|
*devattr, char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct lm83_data *data = lm83_update_device(dev);
|
|
int bitnr = attr->index;
|
|
|
|
return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, 4);
|
|
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, 5);
|
|
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, 6);
|
|
static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, 7);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, 8);
|
|
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
|
|
|
|
/* Individual alarm files */
|
|
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
|
|
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
|
|
static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
|
|
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
|
|
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
|
|
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
|
|
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
|
|
/* Raw alarm file for compatibility */
|
|
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
|
|
|
|
static struct attribute *lm83_attributes[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
|
&dev_attr_alarms.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm83_group = {
|
|
.attrs = lm83_attributes,
|
|
};
|
|
|
|
static struct attribute *lm83_attributes_opt[] = {
|
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_crit.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm83_group_opt = {
|
|
.attrs = lm83_attributes_opt,
|
|
};
|
|
|
|
/*
|
|
* Real code
|
|
*/
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int lm83_detect(struct i2c_client *new_client, int kind,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = new_client->adapter;
|
|
const char *name = "";
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/* Now we do the detection and identification. A negative kind
|
|
* means that the driver was loaded with no force parameter
|
|
* (default), so we must both detect and identify the chip
|
|
* (actually there is only one possible kind of chip for now, LM83).
|
|
* A zero kind means that the driver was loaded with the force
|
|
* parameter, the detection step shall be skipped. A positive kind
|
|
* means that the driver was loaded with the force parameter and a
|
|
* given kind of chip is requested, so both the detection and the
|
|
* identification steps are skipped. */
|
|
|
|
/* Default to an LM83 if forced */
|
|
if (kind == 0)
|
|
kind = lm83;
|
|
|
|
if (kind < 0) { /* detection */
|
|
if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
|
|
& 0xA8) != 0x00) ||
|
|
((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
|
|
& 0x48) != 0x00) ||
|
|
((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
|
|
& 0x41) != 0x00)) {
|
|
dev_dbg(&adapter->dev,
|
|
"LM83 detection failed at 0x%02x.\n",
|
|
new_client->addr);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification */
|
|
u8 man_id, chip_id;
|
|
|
|
man_id = i2c_smbus_read_byte_data(new_client,
|
|
LM83_REG_R_MAN_ID);
|
|
chip_id = i2c_smbus_read_byte_data(new_client,
|
|
LM83_REG_R_CHIP_ID);
|
|
|
|
if (man_id == 0x01) { /* National Semiconductor */
|
|
if (chip_id == 0x03) {
|
|
kind = lm83;
|
|
} else
|
|
if (chip_id == 0x01) {
|
|
kind = lm82;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification failed */
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%02X, "
|
|
"chip_id=0x%02X).\n", man_id, chip_id);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (kind == lm83) {
|
|
name = "lm83";
|
|
} else
|
|
if (kind == lm82) {
|
|
name = "lm82";
|
|
}
|
|
|
|
strlcpy(info->type, name, I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lm83_probe(struct i2c_client *new_client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lm83_data *data;
|
|
int err;
|
|
|
|
data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL);
|
|
if (!data) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
i2c_set_clientdata(new_client, data);
|
|
data->valid = 0;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/*
|
|
* Register sysfs hooks
|
|
* The LM82 can only monitor one external diode which is
|
|
* at the same register as the LM83 temp3 entry - so we
|
|
* declare 1 and 3 common, and then 2 and 4 only for the LM83.
|
|
*/
|
|
|
|
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
|
|
goto exit_free;
|
|
|
|
if (id->driver_data == lm83) {
|
|
if ((err = sysfs_create_group(&new_client->dev.kobj,
|
|
&lm83_group_opt)))
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
data->hwmon_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove_files:
|
|
sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
|
|
sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int lm83_remove(struct i2c_client *client)
|
|
{
|
|
struct lm83_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm83_group);
|
|
sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static struct lm83_data *lm83_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm83_data *data = i2c_get_clientdata(client);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
|
|
int nr;
|
|
|
|
dev_dbg(&client->dev, "Updating lm83 data.\n");
|
|
for (nr = 0; nr < 9; nr++) {
|
|
data->temp[nr] =
|
|
i2c_smbus_read_byte_data(client,
|
|
LM83_REG_R_TEMP[nr]);
|
|
}
|
|
data->alarms =
|
|
i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
|
|
+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
|
|
<< 8);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_lm83_init(void)
|
|
{
|
|
return i2c_add_driver(&lm83_driver);
|
|
}
|
|
|
|
static void __exit sensors_lm83_exit(void)
|
|
{
|
|
i2c_del_driver(&lm83_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("LM83 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_lm83_init);
|
|
module_exit(sensors_lm83_exit);
|